Definition: An overmintmark is defined by the presence of two different , overlapping mintmarks.  The obscured mintmark (the one that is punched in first) is usually thinner and smaller than the definitive mintmark.  This may be due to having been weakly punched into the working die or it may reflect an attempt to abrade (remove) the first mintmark before punching in the second mintmark.

Two overmintmarks are found among 1944-D Lincoln cents.  In each case, a D-mintmark was applied over an S-mintmark.  This may have been an expedient measure undertaken when there was a shortage of working dies at the Denver Mint and a decision was made to reassign some dies that were originally intended for the San Francisco Mint.

A new mintmark was applied to those working dies after an attempt was made to abrade the original S-mintmark. However, traces of the original mint mark remained and can be still seen on the coins.

The first example (left) shows an S-mintmark above the D-mintmark. The second example (right) shows an S-mintmark under a well-centered D-mintmark.